Ключевые слова: alarm, alert, announce, announcement, audio, background, black, broadcast, broadcasting, bullhorn, communicate, communication, concept, control, design, element, equipment, flat, graphic, horn, icon, illustration, interface, isolated, loud, loudspeaker, media, megaphone, message, microphone, music, noise, object, propaganda, protest, public, scream, shout, sign, sound, speak, speaker, speech, symbol, voice, volume, warning, web, white,